Rotary pump



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Patented pr. 1, 1924.

WILLIAM A. HATCHER, 0F DETBOIT,\MICHIGAN, ASSIGNOR TO WERNICKE-HATCHEB' l ,y -1,4s9,o11 UNITED STATT-:s PATENT oFFlcE.

i PUMP GOMPAN'Y, OF GRAND RAPIDS, MICHIGAN, A CORPORATION' OF MICHIGAN.

ROTARY PUMP.

Application mea February 19, 1921. serial no. 446,467.

To all 'whom t may concern:

Be it known that I, WILLIAM A. HATCHER, a citizen of the United States, residing at Detroit, county of-Wayne, State of Michigan, have invented certain new and useful'Improvements .in Rotary Pumps, of which the following is a specification.

This invention relates to improvements in rotary pumps.l x

The objectsv o f the invention'alrl :i

First, to 'provide a rotary piston pump in which the parts are effectively balanced.

Second, 'to provide a .rotary pump in which .effective` sealing a ainst leaks to or from thegworkng cham er can be easily maintained. v i

Third, to provide ay rotary pump inl which the movement of'the parts on .each other is minimized to facilitate ,the sealing of working members andl insure close contact of the piston with the cylinder wall surface withvout excessive friction.

v Fourth, to provide av connection means loe- I tween the cyhnder and piston of such a rotary pump that shall lessen thestrain on the vane. i

; Further objects and objects which pertain to details and economies of construction and operation will definitely appear from the detailed description to follow.

I accomplish the objects of my invention by the .devices and means described in the following` specification. The invention is clearly defined and'pointed out in the claims.

A structure which is a preferred embodiment of my invention is fully illustrated in the accompanying drawings, forming a .part

of this specicatiom in'which: Fig. I is a detail side elevation* view of my improved pump, theguard being'shown in v section on line 1-1 of Fi III.

detail horizontal Fig. II is an enlarge sectional view taken on line 2--2 of. Figs. I, III and V.

Fig. III is an enlarged detail transverse sectional view 4taken on line 3`3 of Figs. I and II,a part being broken' away to show the intake port in the piston and the discharge passage and port in the cylinder.

Fig. IV 4is a partial. detail sectional view,

rotation.vv

Fig. V is an 'enlarged detail sectional view taken on line 5--5 of Figs. I and III,'show 9 (see Fig. II).

- ing further details of the vane and the method ofsupporting andfcoupling the-piston to the cylinder, the section lines being some-A what irregular, as seen' in Fi II.

.Fig VIv is an enlargedview taken on line 6-6 of Fig. II, showing In the drawings all of the sectionalviews are taken looking inthe. direction of thelittle arrows at the ends4 of the section lines and similar. numerals of reference refer to similar arts throughout the several views.

Consi ering the numbered parts of the drawing, 1 is the base, .having standards 2, 3,.at each end. The standard 2 has a journal bearing box 4 atits upper end in which etail sectionalvdetails of the means 'fof retaining the main bearing and bushing for the piston in place.

revolves the driving shaft 5, a suitable ball 4 bearing being interposed. TheV standard 3 has a capz at its upper end which holds the journaled su port 7 for the cylinder and lpiston secure y in place, on which is also carlried the end bracket or fixed head 8 of the pump. The intake 7 is through this support. 9 is the discharge pipe leading from the xed head, which'fixed head contains the annular discharge conduit 20. l

l0 is the sheet metal guard which sur-` rounds the rotary pump (see Figs. I, II and III). The guard is supportedl in place by suitable arms 11 attached to the fixed head 8 and is also attached to the base 1.

.12 is the pumpcylinder having heads 13 and 17. The head .13 has the central hub 14 secured to the driving shaft 5 by a key 14 and the cross pin 15 therethrough. 16 is an enlarged portion ofthe cylinder for the A discharge passage at the periphery of the pump, The head 17 contains the discharge assage 19. A `ball bearing 18 is within the liub and betweenit and the journaled' suport 7 and in axial alinement with the drivmg shaft 5. The discharge passage 19 connects to the annular passage 2 0 in the lixed head 8 and leads oii to the discharge pipe The face 21 of the head casin Hat surface on the fixed end racket between which is aring packing 22 to maintain a sealed joint. The casing is extended into a hub 23, the end of which is faced and loc extends within the fixed head or bracket 8.

There is a double ring packing, 24, 25 at this oint. As these packings are made the sub- )ect matter of an independent patent applipiston 28 is supported on the ball bearings cylinder when the 29, carried on the osetcrank-shaped portion 30 on the inner end of the'jouinalled support 7, eccentric to the cylinder bearing. A bushing 31 is disposed around this crank ortion for separating the bearings29. The earings 29 are retained in place by the supporting and locking pins 32 interposed between the same and a flattened side of the crank-shaped part 30 to prevent turning so that bearings 29 can slide endwise to allow t e iston to locate itself to the cylinder. A,

cran -shaped piece 33 is secured to the end of the part 30, having a crank-like pin 34 in an end socket. Cross pin 36 extends transversely through the bushing 31, the crankshaped piece and the pin 34 to retain them i'n operative position. This .crankshaped part 33 has an outwardly projecting piny which is in axial alineinent with the driving shaft 5. A ball bearing 35 sur-y rounds the crankpin 35, as seen in Fig. II, and is axially alined with the main bearing of the casing. y

It will thus be seen that the journals on which the piston revolves are very eec- `tively su 'ported and eiectively alined with the cylin er. Packing rings, 37 the air ring and 38 the oil i'ing, are interposedbetw'een the face of the piston and the said head 13.

A series of small parallel'cranks 39, disposed parallel to a plane through the cylinder and' piston bearing, are jonrnaled at 40 in suitable bushings 41 in the piston. and with the projecting pins 42 journaled in the casing at 43, maint-ain the piston in correct relative operative position to the ump is being rotated by the driving sha t 5. Oil holes 44 are provided for lubricating the little crank pins 30 (see particularly Figs. II and V).

The piston 28 is made hollow at 45 and has a central hub 45 and a radial block portion-46 having a radial recess in which is disposed the specially constructed vane 47. This vane has laterally projecting lugs or fingers-48 on the inner side at each end, whichengage transverse grooves 49 in the cylinder heads 13 and 17, said grooves being disposed at right angles to the radius of the vane. The vane is specially vconstructed of divided sliding members to fill the space and avoid the necessity of special packing. As I have made these vane features the subject matter of a separate concurrent patent application, Serial lNo. 446,469, yfiled Feb. 19, 1921, I do notdescribe them here in detail.

The outer end of this vane oscillates back and .forth on a plane surface 50 (see Fig. V) tangent to the inner cylinder wall at the` point of contact of the vane. This oscillatory rubbing contact insures a erfect seating. vAu intake port 51 is forme in the piston at the side of the radial recess walls l46 in rear of the vane/47, and a discharge port 52 is put through the cylinder on the opposite side ahead of the vane (see Fig.

V). By reversingthe direction of the drive, the cylinder port becomes the intake and the piston portbecomes discharge port.

53 is the crescent-shapedl working' chamber i through the intake through the fixed portions at 56, as seen in Fig. II. A grease cup 57 is provided for the driving shaft 5 (Fig. i). f f

The operation is simple and very readily followed. lVhen the drivin shaft 5 is driven, air enters through tie intake 7 passes out the radial passages 26 into the chamber 27, and connects into the hollow 45 .of the piston 28, and passes( out into the cylinder chamber 53 through the port 51. As both the cylinder and thev iston are revolving, these parts will pass romthe position indicated in Fig. III to the position indicated'in Fig. IV, and this'inovement causes the cylinder to take in air at the intake port 51 and to discharge at the outlet port 52, owing to the displacement by the piston within the cylinder. The contact of the piston with the inside of the cylinder, walls is subject to a limited compensating movement. parts is maintained by the little cranks 39. The slight movement between the piston and cylinder due to difference of centers causes oscillation at the outer end or side of the vane 47 against the tangential flat surfaceA 50, which is specially formed Hat to insure a good sealing surface. Each revolution of the shaft 5 opensV and closes the crescentshaped chamber 53, giving a complete iin- 'pulse to the pump.

runs without any appreciable vibration and with practically no noise. Because the piston and cylinder are coupled and maintained in parallel relation andthe vane is l carried by one (the piston) and' abuts against the other (the cylinder) and per- The relative parallelism of the posed between the mits a. to-andffro movement, 4the strain and frlctlon is minimized andthe joints are easily kept sealed. The little crankvllke devices are preferred and arev very superior for this purpose. I am aware .other means could be employed and I desire to claim these features specifically and yters Patent is:

1. Ina rotary pump the combination of a suitable cylinder,l a driving shaft connected to one head thereof 'to revolve the same, a fixed journaled support, with antifriction bearings between 1t and the Ysaid cylinder, an odset crank-likeportion on said journaled support, a lhollow cylindrical piston of less diameterthan saidcylinder disosed on said crank-like support, on bearmgs eccentric to thebearing support of the said cylinder, said piston having a radial recess at one side and an intake port' in proximity thereto, a discharge passage through the head to the periphery of the said cylinden and a discharge port connecting thereto, intake passages connecting to the cavity within the said piston, a vane disposed in said :radial recess having suitable projecting lugs at each side of the inner end, slotted rooves at right angles to the radius of 4t e said piston for receiving the said vane projections, a lane surface at right angles to the radius Within the periphery of said cylinder for contact with fthe opposite end of said vane, thevane being disposed between said intake and discharge orts, packing interfiices of said piston r and cylinder, and coupling means connecting the head of said cylinder l to the face of said piston, comprising a series of parallel cranks disposed in planes parallel to the plane of the center line of the bearings -of said cylinder and' piston, all coacting substantially as vdescribed for. the. purpose,

specified. l l

2. In a rotary pump the comblnation of a suitable cylinder, a driving shaft connected to vone head thereof toy revolve the same, a .fixed journaled support, with anti-friction bearings between it and the said cylinder,

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an offset crank-like portion on said journaled support, a hollow cylindrical piston of less diameter than said cylinder disposed on said crank-'like support, o'n bearin s eccentric to the bearing support of. the said cylinder, said piston having a radlal recess at one side and an intake port in proximity thereto, a discharge passage through the bead to the vperiphery vofthe said cylinder and a discharge port connecting thereto, intake passages connecting to the cavity With- 'inthe said piston, ava-ne disposed in said radial recess having suitable projecting lugs at each side of the inner end, slotted grooves at right angles tothe 'radius of the said Ypiston for receivingthe said vane projections, a plane surface at right angles to the radins within the periphery of said cylinder for contact with the opposite end of said vane, the vane being disposed between said intake and discharge ports, and coupling means connecting the head of said'cylinder tothe face of said piston, comprising a series of parallel cranks disposed in planes parallel to the plane of the center line of the bearings of said cylinder and piston, all coacting substantially as described for the purpose specified.

3. In a` rotary pump the combination of a suitable cylinder, a fixed journaled support therefor, a driving shaft to drive said cylinder, a hollow cylindrical piston of less diameter than said cylinder disposed eccentrically within the same to contact with the wall thereof, bearings on said fixed support for said piston eccentric to the lbearings for saidcylinder, a vane disposed in a radialrecess in the said piston with lateral projections to engage guiding grooves in the heads of the said cylinder, guiding grooves in said cylinder heads at right angles to the radius thereof, a fiat surface formed in said cylinder wall to coact with the outer end of said vane, couplingmeans,connect` ing the face of said pistonto` the head of said cylinder, comprising a series of parallel crank devices, a suitable peripheral intake port in the said piston in proximity to said vane and, a suitable discharge port Yon the opposite sideof said vane in the pe- Ifiphery of said cylinder, coacting as specia suitable cylinder, a fixed journaled supcylindena hollow cylindrical piston of less diameter than said cylinder disposed eccentrically within the same to contact with the Wall thereof, bearings on said fixed support for said piston, eccentric to the bearings for said cylinder, a vane disposed in a radial recess in the said piston, a flat surface formed in said cylinder Wall to coact With the outer end of said vane, coupling means connecting the face of said piston to the head of said cylinder, comprising a series of parallel crank devices, means to maintain the said vane in contact with said surface, a lsuitable peripheral intake ort in the said piston in proximity to sai vane, and a suitable discharge port on the opposite 4: In arotarypump the combination of.

side of said vane in the eriphery of said therefor, a driving shaft to drive said cylin# der, a 4cylindrical piston of less diameter than said cylinder disposed eccentrically within the same to contact with the Wall thereof, bearings for said piston eccentric to the said bearings for the said cylinder, a vane disposed in a' radial recess in the said piston, with lateral projections to engage guiding grooves in the heads of the said cylinders, guiding grooves in the said cylinder heads, coupling means connecting the face of the said piston to the inner face of said cylinder, comprising a series of parallel crank devices, a suitable peripheral intake port in the said piston and a suitable discharge port on the opposite side of said vane in the periphery of said cylinder, coacting as specified.

6. In a rotary pump the combination of a suitable cylinder, a fixed journaled support therefor, driving means for said cylinder, a

cylindrical piston of less diameter than said cylinder disposed eccentrically Within the same to contact with the Wall thereof, bearings for said piston eccentric to the said'bearings for the said cylinder, a vane disposed in a radial recess in the said piston, With lateral projections to engage guidin grooves in the heads of the said cylin ers, guiding grooves in the said cylinder heads transverse to the plane of said vane, coupling means periphera connecting the face of the said piston to the inner face of said cylinder, comprising a series of arallel crank devices, a suitable lpintake portin the said piston, and a suitable discharge port on the opposite side of said vane in the periphery of said cylinder, coacting as specified.

7. In a rotarypump the combination of a suitable cylinder, a fixed journaled su port therefor, driving means for ysaid cylin er, a cylindrical piston of less diameter than said cylinder disposed eccentrically Within the same to contact with the Wall thereof, bearvings for said piston eccentric to the said bearings for the said cylinder, a vane disposed 1n a radial recess in the said piston, -with laterall projections to engage iding grooves in the heads. of the said cy inders, guiding grooves intheis'aid cylinder heads transverse to the planeofsaid vane, coupling means connecting the 'face of the said piston to the inner face of said cylinder, a suitable,

peripheral intake port in the said piston, and a sultable discharge port on the op osite side of said vane inthe periphery of said, coacting as specified.

8. In a rotary pump the combination of a suitable cylinder, a fixed journaled support therefor, driving means for said cylin er, a.

cylinder,A o

' k.means to urge said vane outwardly and vcylinder disposed eccentrically within the same to Contact with 'the Wall thereof,'bear ings for said piston eccentric to the said bearings for the said cylinder, a vane disposed in a radial recess in the said piston, with lateral projections to engage guiding grooves in the heads of the said cylinders, guiding grooves in the said cylinder heads transverse to the plane of said vane, means to revolve the said piston at the same rate as said cylinder, a suitable peripheral intake port in the said piston, and a suitable discharge port on the opposite side of said vane in the periphery of said cylinder, Acoacting as specified.

9. In a rotary pump the combination of a suitable cylinder, a fixed journaled support therefor, driving means for said cylinder, a cylindrical piston of less diameter than said cylinder disposed eccentrically Within the same to contact with the wall thereof, bearings for said piston eccentric to the said posed in a radial recess in the said piston, means to maintain said vane in contact with the cylinder Wall, coupling means connecting the face of the said piston to the inner face of said cylinder, comprising a series of parallel crank devices, a suitable peripheral intake port in the said piston and a suitable discharge port on the opposite side of said vane in the periphery of said cylinder.

10. In a rotary pump the combination of a suitable cylinder, a fixed journaled su port therefor, driving means for said cylin er, a cylindrical piston of less diameter 'than said cylinder disposed eccentrically Within the same to contact with the Wall thereof, bearings for said piston eccentric to the said bearings forthe said cylinder, a vane disposed 1n a `radial recess in the 'said piston, means to urge said vane outwardly and main# tain it yieldingly in oscillatory rubbing contact with the cylinder wall, coupling means connecting the face of the said piston to the inner face of said cylinder, a suitable peripheral intake ort -in the said piston, and a suitable discharge port on the o posite side of said Vane yin the periphery o said cylinder, coacting as specified.

11. In a rotary pump the combination of a suitable cylinder, a fixed. journaled support therefor, driving means for said cylinder, a cylindrical piston of less diameter thanv said cylinder disposed eccentricallly Within the same to contact with the Wall thereof, bearings for said piston eccentric to the said bearings for the said cylinder, a vane disposed in a radial recess in the said piston,

maintain it yieldinglylin oscillatory rubbing contact with the cylinder wall, means to revolve the said piston at the same rate loo -a suitable cylinder, having a restricted plane surface at one side, a fixed journaled support therefor, driving means for said cylinder, a cylindricalpiston of less diameter than said cylinder disposed eccentrica-ily within -the same to `contact with the Wall thereof,

bearings for said piston eccentric. to the said bearings for the said cylinder, a vane disposed in a' radial recess in the said piston, means to maintain said vane in Contact with the plane surface of the cylinder Wall,

, means to revolve the said piston at the same rate as said cylinder, a suitable peripheral intake port in the said iston', and a suitable discharge port on the opposite side of said vane in the periphery of said cylinder, coacting as speci ed.

13. In a rotary pump the combination of a suitable cylinder having a restricted plane surface at one side of its periphery, a holloyv cylindrical piston of less diameter than said cylinder, disposed eccentrically withln the same -to contact with the wall thereof,

a vane disposedA in a radial recess in the said piston with lateral projections to engage uiding grooves in the heads of said cylin ers, and guiding grooves 1n the` said e vane to maintain said vane in contact when the pump is being driven.

14.. In a rotary pump the combination of a suitable cylinder, a hollow cylindrical pis'- .ton of less diameter than said cylinder, disvane in contact with said cylinder wall when the pump is being driven.

15. In'a rota pump the combination of a suitable cylin er, a cylindrical 'piston of less diameter than said cylinder, disposed eccentrically within the same 'to contact with the wall thereof, a vane disposed in a radial recess in the said piston with lateral projections to engage guiding grooves in the cylinder heads ltransverse to the plane of. 't

with the plane surface of said' cylinder wall heads of said cylinders, and guiding grooves in the said cylinder heads transverse to theplane of the vane to maintain said vane in contact With saidl cylinder wall when the pump is being driven.

16. In a rotary pump the combination of a suitable cylinder,a hollow cylindrical piston of less diameter than said cylinder disposed eccentrically Within the same to conf tact with the Wall thereof, a Ifixed journalcd support with bearings for the said cylinder, an` oii'set Crank-like portion with bearings for the said piston, and a detachable end portion with Ybearing concentric with thecylinder bearings, coacting as specified.

17. In a rotary pump the combination of a suitable cylinder, a hollow cylindrical piston of lessdiameter than vsaid cylinder disposed eccentrically Within the same to contact with the wall thereof, a fixed journaled support with bearings for the said cylinder, anofset crank-like portion with bearings for the said piston, and an end portion With bearing concentric with the cylinder bearings, coacting` as specified.

18. In a rotary pump a suitable cylinder, a c lindrical piston of less diameter than sai cylinder disposed eccentrically within the same to contact with the walls thereof, bearings for supporting the. said cylinder Aand piston in said relative positions, means connecting the said piston the combination of v and cylinder to maintain the same in parallel relation the oneto the 'other during rotation, and means for. driving the same, as described. i

19. In a rotar pump the combination of positions, a vane disposed in a recess in said piston and abutting the circumferential wall of said cylinder, means independent of said vane connecting the said piston and cylinder to maintain the same in parallel relation the one to the other Iduring rotation, and meansA A 105 In witness whereof, I have hereunto set` for driving the same, as described.

my hand and seal in the presence of two Witnesses.

WILLIAM A. HATCHER. [1.. a]

Witnesses:

Wmueu F. Hnnzoo, HARRY E. Wumus. 

